On Tuesday 05 January 2021 10:47:16 andy pugh wrote: > On Tue, 5 Jan 2021 at 15:40, Thomas J Powderly <tjt...@gmail.com> wrote: > > Thats a max step/sec of 13333 for that particular sequence of 2 > > steps. > > > > That sequence can happen at anytime in a cnc path. > > Not so. A stepper will only ever reverse at zero speed, when the step > rate is zero. So you don't need to make allowances for setup.
This might be so, but zero speed is very fleeting for the reversal at the bottom of a g33.1. Even if being sequenced by hal tricks like I am. And a step loss at the bottom turnaround could cause the sloppy oversized threads I am getting when I have to peck exec with a descending turn around due to lack of torque to drive the tap of that size in one stroke so I write a peck loop. I'd have no trouble expanding that spindle stopped window, its a setp in my hal code, so how long a dead time between encoder pulses do I need in order to guarantee no loss of Z steps in that condition? Thanks Andy. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
